namespace MMDAL.DTO.StockValuation;

/// <summary>
/// On-demand "how was this cost arrived at?" breakdown.
/// Returned by GET /StockValuation/GetCostWorkings.
/// Never cached — always computed live.
/// </summary>
public class CostWorkingsDTO
{
    public int     ItemId              { get; set; }
    public string  ItemCode            { get; set; } = string.Empty;
    public string  ItemName            { get; set; } = string.Empty;
    public int     SKUId               { get; set; }
    public string  SKUName             { get; set; } = string.Empty;
    public int     StoreId             { get; set; }
    public string  StoreName           { get; set; } = string.Empty;
    public DateOnly AsOfDate           { get; set; }
    public string  ValuationMethod     { get; set; } = string.Empty;
    public decimal CurrentCost         { get; set; }
    public decimal CurrentQuantity     { get; set; }
    public decimal CurrentValue        { get; set; }

    public CostWorkingsOpeningDTO? OpeningBalance  { get; set; }
    public List<CostWorkingsLineDTO> Transactions  { get; set; } = [];
    public CostWorkingsClosingDTO?  ClosingBalance { get; set; }

    // For WtAvg: formula description
    public string? Formula             { get; set; }
    public decimal? CalculatedCost     { get; set; }

    // For FIFO/LIFO: open cost layers
    public List<CostLayerWorkingDTO>? CostLayers    { get; set; }
    public decimal? BlendedCostNextIssue             { get; set; }

    // For make items: BOM breakdown
    public MakeItemCostWorkingsDTO? MakeItemWorkings  { get; set; }
}

public class CostWorkingsOpeningDTO
{
    public DateOnly AsOf       { get; set; }
    public decimal  Qty        { get; set; }
    public decimal  Value      { get; set; }
    public decimal  Cost       { get; set; }
    /// <summary>"CertifiedSnapshot" or "FullHistory"</summary>
    public string   Source     { get; set; } = string.Empty;
}

public class CostWorkingsClosingDTO
{
    public decimal Qty   { get; set; }
    public decimal Value { get; set; }
    public decimal Cost  { get; set; }
}

public class CostWorkingsLineDTO
{
    public DateOnly Date        { get; set; }
    public string   DocNumber   { get; set; } = string.Empty;
    public string   TxnType     { get; set; } = string.Empty;
    public decimal  Qty         { get; set; }
    public decimal  UnitCost    { get; set; }
    public decimal  Value       { get; set; }
    public decimal  RunningQty  { get; set; }
    public decimal  RunningValue { get; set; }
    public decimal  RunningCost { get; set; }
}

public class CostLayerWorkingDTO
{
    public DateOnly ReceiptDate     { get; set; }
    public string   DocNumber       { get; set; } = string.Empty;
    public decimal  OriginalQty     { get; set; }
    public decimal  RemainingQty    { get; set; }
    public decimal  UnitCost        { get; set; }
}

public class MakeItemCostWorkingsDTO
{
    public string  CostType          { get; set; } = string.Empty;  // "Standard" / "Actual"
    public string  CostAnalysisCode  { get; set; } = string.Empty;
    public DateOnly PeriodFrom       { get; set; }
    public decimal MaterialCost      { get; set; }
    public decimal ProcessCost       { get; set; }
    public decimal SubcontractCost   { get; set; }
    public decimal OverheadCost      { get; set; }
    public decimal TotalStandardCost { get; set; }
    public decimal ActualVariance    { get; set; }
    public List<BomLevelCostDTO> BomLevels { get; set; } = [];
}

public class BomLevelCostDTO
{
    public int     BomLevel          { get; set; }
    public int     ItemId            { get; set; }
    public string  ItemName          { get; set; } = string.Empty;
    public decimal Quantity          { get; set; }
    public decimal UnitCost          { get; set; }
    public decimal LineValue         { get; set; }
    public decimal MaterialCost      { get; set; }
    public decimal ProcessCost       { get; set; }
    public decimal SubcontractCost   { get; set; }
    public decimal OverheadCost      { get; set; }
    /// <summary>Non-null for make sub-items: their own BOM breakdown.</summary>
    public List<BomLevelCostDTO>? Children { get; set; }
}